"A common modification was devised [from Lambert
azimuthal equal area] by ernst Hammer in
1892 and is called the Hammer or Hammer- Aitoff projection.It consists of halving the vertical
coordinates of the equatorial aspect of one hemisphere and doubling the values of the meridians
from center. It retains equality of area, but it is no longer azimuthal" [Snyder
1987, p. 182]